> Does anyone know of any corpora containing text from English comic books,
> graphic novels or similar?
Not that I know of, but Arnold Zwicky (http://www.stanford.edu/~zwicky/) had a call out earlier this year for an assistant for a ‘Linguistics in the comics’ project that might result on something of the sort.
A text-only corpus would be singularly inappropriate for this genre, though.
Best,
Alon